Witchoil leakage. Iron golems are powered by witchoil. This necrotic substance starts to leak from the golem's body once it is reduced to half (40) HEALTH, and splashes onto targets hit by the golem for an additional 1d6 acid damage. When the golem is destroyed, witchoil sprays everywhere, doing 1d6 acid damage to everyone within 10' of the golem. The acid seeks into joints and gaps in armor, ignoring SOAK.
Hurl object. The golem can pick up a nearby object of size large or smaller and fling it at a target.